Cannot use Macros as the source for an image

Steps to reproduce

Create the page /Main/Target with the following page contents

    http://the-toast.net/wp-content/uploads/2015/07/Futurama_fry_looking_squint2.jpg

Create the page /Main/Test with the following content:

    {{include reference="Main.Target.WebHome" /}}

    image:http://the-toast.net/wp-content/uploads/2015/07/Futurama_fry_looking_squint2.jpg

    image:{{include reference="Main.Target.WebHome" /}}

Expected

Line 1: the page contents of the page Main.Target.WebHome
Line 2: the image at URL http://the-toast.net/wp-content/uploads/2015/07/Futurama_fry_looking_squint2.jpg displayed on the page
Line 3: the image at URL http://the-toast.net/wp-content/uploads/2015/07/Futurama_fry_looking_squint2.jpg displayed on the page

Actual

Line 1 (WORKING AS EXPECTED): the page contents of the page Main.Target.WebHome
Line 2 (WORKING AS EXPECTED): the image at URL http://the-toast.net/wp-content/uploads/2015/07/Futurama_fry_looking_squint2.jpg displayed on the page
Line 3 (BROKEN): a broken image, with the source as { { include and the text reference="Main.Target.WebHome / } } immediately following the broken image

Thoughts

As far as I can tell, the image: syntax token has a higher order of operations than the {{ }} macro syntax token. Therefore, the opening of the macro, up until the first space is counted as being part of the image declaration rather than being associated with the macro. The macro should have higher precedence in the syntax tree and get evaluated before being used as a source for the image tag.